The ctype_lower() function is an inbuilt function in PHP which is used to check whether the given characters in the string is lower case or not.
Syntax:
bool ctype_lower( string $text )
Parameters: This function accepts single parameter $text which holds the string that need to be tested.
Return Value: This function returns TRUE if all characters of a string is a lowercase character in the current locale.
Below programs illustrate the ctype_lower() function in PHP:
Program 1:
<?php // PHP program to check the string contains // all lower case characters or not $strings = array('gfg123', 'neveropen', 'GfG'); // Loop to check the above three strings foreach ($strings as $testcase) { if (ctype_lower($testcase)) { echo "Yes\n"; } else { echo "No\n"; } } ?> |
Output:
No Yes No
Program 2:
<?php // Declare a string $str = "neveropen"; $n = strlen($str); $count = 0; for($i = 0; $i < $n; $i++) { if(ctype_lower($str[$i])) { $count++; } } echo "Totla number of lower case " . "character in string: " . $count; ?> |
Output:
Totla number of lower case character in string: 11
Reference: https://www.php.net/manual/en/function.ctype-lower.php
